mruby/mruby — pull request #1545 by Fleurer (2013-10-24 18:50:49+00:00)
Title: Fix1544

We have already reserved that register in codegen()'s case NODE_DEF, but
what we care about is actually the previous register. So what we need is
get that register by cursp() after pop(), then recover the reservation
by push().

#1544